Questions tagged [science-based]

For questions that require answers based on hard science, not magic or pseudo-science, but do not require scientific citations. Contrast with the hard-science and reality-check tags. Do not use this tag as the only tag on a question because it describes how the question should be answered, not the topic.

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2
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2answers
179 views

How feasible would humans beings wiped out by plant aliens be?

In my world, the population of mankind has been all but wiped out by the accidental introduction of extraterrestrial plants brought to earth by scientists who were attacked by them. The plants ...
5
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4answers
388 views

Cryo-Pods For Unaltered Humans

OK, faster than light isn't possible & a merely significant fraction of it can begin to stretch the bounds of reasonable reality as that fraction increases // so a less unreal way to allow us our ...
5
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8answers
372 views

Making the moon red? Physics please!

I am writing a science-fiction/fantasy novel and I've come to a sci-fiesque part in my story where I am entertaining several options for a scene, one of which could involve some pretty serious science....
3
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5answers
110 views

Could a planet form from the remnants of a star and its solar system?

This is just a simple question, and I haven't thought all that well on it, but I think in terms of sci-fi and fantasy less tied to probable scenarios this could be quite possible. Imagine a free-...
5
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4answers
257 views

Densest breathable atmosphere composition for a human being without breathing equipment

Setting on Earth, sometime in the near future (50/100 years). A large sealed pressurized environment is set up in an even larger industrial complex. Workers get in and out of the environment for their ...
7
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6answers
441 views

How would this astronaut-in-training know she was in a pool on the Moon and not on the Earth?

Many are familiar with the scenes of astronauts-in-training practicing weightless activities while submerged in a pool with neutral buoyancy. In this scenario, an astronaut is in such a pool, ...
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1answer
173 views

Can a planet hypothetically have two atmospheres with an ocean in between?

I want my hypothetical planet to have a sort of ocean to filter out radiation, but density is problematic. There would have to be an outer atmosphere, and then some form of ocean-like liquid that is ...
2
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2answers
695 views

What effect would water that is twice as dense, while still liquid, have if a human were to try and swim in it?

In my world there are two bodies of water. One acts as a radiation shield and is part of the atmosphere, so it needs some (undecided) force to keep it in place. The other is ideally twice as dense as ...
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0answers
67 views

World with Demons, Merfolk, Angels, and Humans living together

I am writing a prospective scenario for a satirical horror-comedy and science-fantasy Web-series for adolescents (or teenagers if you want) and adults where humans cohabit with demons, merfolk, and ...
0
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1answer
72 views

What will Earth's orbit around the sun look like if it were standing at an axial tilt of 66.5 degrees? [closed]

Earth currently stands at an axial tilt of 23.5 degrees, low enough for seasons to form. Here is the diagram below: In the spring and autumn months, Earth parallel to the sun. In the summer, it ...
27
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19answers
8k views

How can I hide my island in the 1600s?

I have time traveled to the past on an oriental country in southeast Asia. I want to hide my island from European colonists using some technology available in both the future and the past. Would ...
3
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1answer
72 views

Climate model for an S-type binary

I have recently created a planet and I've decided it will exist in a binary system. It will orbit a red dwarf which will, in turn, orbit a red giant that has evolved from a very low mass star (so it ...
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2answers
52 views

How much energy an active structure would need to be a vacuum balloon?

In this question here there is an answer telling that it would be possible to make a vacuum balloon using superconductors, however, we are nowhere close to a room-temperature superconductor. Assuming ...
13
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8answers
2k views

How could I justify that ancient humans ruins have not been discovered?

Scenario: Earth's history is 100% equal to reality . It’s the year 2040. First interplanetary cities with 3% total population of mankind. 200 million years ago humans appeared on Venus, developing ...
1
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1answer
90 views

It is possible to slow down time without a Black Hole? [closed]

Well, I saw a interesting question in other sites and it made me wondering. Since cryogenics and hibernation aren't exactly that easy, and colony ships that travel through the eons in space carrying ...
4
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3answers
161 views

Is this space fighter rapid deployment system feasible?

Had this idea for a rapid space fighter deployment system and wanted to see if anybody sees a flaw I'm not. Imagine a big circle in space, and inside that circle are 'stacks' of space fighters facing ...
2
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1answer
165 views

Giant Parasite Wearing a Human Flesh Suit

I'm working on designing a creature for a sci fi horror story. The organism did not naturally evolve so any concerns about these traits evolving naturally can be handwaved. For the purposes of the ...
2
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0answers
80 views

Features of a tricorder from 2060 [closed]

The tricorder (in the generic, non-trademarked sense) is a vital companion for any colonist to the outer Solar System. But what does it detect, and how? Passive imaging. Using superlens/hyperlens/...
2
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2answers
202 views

Is this sci-fi weapon of mine realistic?

M36 Rifle Operation: Select-fire, gas-operated, magazine-feed, ETC Mass: 2.9kgs (unloaded) 3.5kgs (loaded) Barrel Length: 50.8cm Cartridge: 6.8x31mm caseless RoF: 500rpm (3r) 1800rpm (full-auto) ...
5
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1answer
145 views

How much further could ship-based radar see on a flat world?

On our spherical planet, it is highly advantageous for modern navies to have airborne radar, because it can seem much further than even the best ship-based radar, simply due to the greater distance to ...
0
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1answer
64 views

Scanning for Resources and Mapping a Rogue Planet

EDIT: Thanks to Starfish Prime's answer to this it looks like the atmospheric ice would only be ~16m thick, and the water vapor is a rounding error. I have adjusted the layering to account for their ...
7
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3answers
208 views

How large can you build humanoid mechs with modern materials before they start experiencing structural problems?

I'm working on ideas for a game that will involve mechs of varying sizes and shapes and I am trying to establish an upper limit of size for humanoid mechs. This isn't about practicality, that is ...
2
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1answer
124 views

How accurate was/ could minting be in the early middle ages regarding to the shape of the coin (circular)?

I am having trouble finding information on this and I lack the knowledge to know how feasible or not this would be. I'd like to know how perfectly round coins could be made in the early middle ages. ...
3
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5answers
206 views

How would giant mermaids wage raids/warfare against ships?

Part 2 of How could medieval ships protect themselves from giant mermaids? While hominids may rule the land, giant mermaids dominate the sea! Many nations employ these giant mermaids to wage warfare ...
3
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1answer
62 views

Visual characteristics of planetary gas torus

In the universe I'm currently developing, humans stumble upon a magical alien construction: a small star surrounded by a gaseous torus of mostly molecular nitrogen & oxygen and atomic hydrogen &...
2
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0answers
76 views

Wind strength in a massive planet

I'm working on this planet that has 1.5x earth's mass, so the gravity is a little stronger, given that the density it's the same. The gravity is 1.15x earth's. As i don't know how to calculate the ...
1
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1answer
93 views

Can a creature in its cocoon opalize various parts of its anatomy voluntarily?

Now, in this world I'm creating, dragons have larvae, called wyrms. There is a specific species of dragon, Spelunca meliusculus, or the superior dragon, that dwells in a special cavern. There is a ...
5
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1answer
61 views

Tides on a planet with a similar moon but closer to the planet

So i'm building this planet and i want to know how the tides work in there! Moon absolute info (comparing to our moon) Mass 8.663x10²²kg (1.18) Radius 1794.12km (1.03) Density 3583kg/m³ (1.07) ...
4
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3answers
182 views

Genetic personality [closed]

I want a family of humans born with insticts that come fron their parents. Father smithsman and mother vampire hunter = child attracted to metalworking and with a natural hate and instincts to murder ...
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1answer
99 views

Could my Adnaps exist?

I imagined a hypothetical mammalian species of the Cetartiodactyla order and of the Ruminantia suborder: adnaps. They are the opposite of giant pandas: if giant pandas are vegetarian carnivores (they ...
4
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2answers
79 views

Effects of a theoretical parasitic superfungus on the ecosystem

I came up with an idea for a parasitic fungus for my world, and I was wondering if it would be biologically viable/possible. Here are its traits. After the target organism breathes in the spores, they ...
4
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0answers
86 views

How much I can change the humanoid body plan and still be able to perform the high speed throwing?

Why keep the humanoid body plan?, which is the advantage of the humanoid shape? This were my principal questions when I was wondering about the features of different fictional specie, so I reached to ...
11
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18answers
4k views

How would you slow down a large object traveling through space?

I have a concept for an asteroid mining station. The metal ingots that are processed are fired out of a railgun towards Earth. How could I slow the ingots down before reaching Earth to avoid ...
2
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1answer
79 views

What would the lakes of a planet with larger glaciers look like?

** This question is making the assumption that if a planet with a similar size and atmosphere of Earth is colder and has longer nights, it will have larger and more numerous glaciers. If this is not ...
-1
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1answer
90 views

How much sugar and potassium nitrate I would need to make a rocket reach the moon? [closed]

I know the question itself is kinda crazy, but a rocket need a fuel and a oxidiser to work. And in this case, the oxidiser is potassium nitrate. Well, in this video, this guy makes a homemade rocket ...
2
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1answer
64 views

Energy costs and gains for creature growth at a molecular level

This is a long time scale creature - it experiences a thousand years in the fashion that we experience one. It grows by pulling one neutron from a $C^{12}$ molecule and building it onto other carbon ...
6
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0answers
180 views

How to correctly insert a kangaroo like balance and support tail in a humanoid? [duplicate]

I was thinking about humanoid designs, usually the most prolific version adds a digitigrade posture, looks cool and have some advantages for cursorial creatures providing speed but reducing stability ...
1
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2answers
60 views

perception difference of rotation effect

If you were inside and at the tip of a 100 meter tube shaped ship travelling outside of gravity wells, and at a good speed (not relativistic nor ftl); would you perceive the difference if the ship ...
4
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2answers
124 views

What will Glacier Bay National Park look like in 2000 years?

I am working on a story that takes place roughly 2000 years after a worst-case-scenario climate apocalypse. It revolves around a society located in present-day Glacier Bay National Park on the Alaska/...
2
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3answers
153 views

Plant used-to-create genetically-engineered floating islands?

I was wondering after considering the trope of floating islands, genetically modified/genetically engineered plants that produce carbon nanotubes, which as a byproduct forming vacuum tubes as they ...
12
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5answers
3k views

Could We See a Lagrange Giant in the Sky?

The "Lagrange giant" in the title refers to a gas giant that orbits its star in the same distance as Earth does. The alternative description is "Trojan planet" or, to be most ...
2
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1answer
65 views

What environmental and ecological effect would a massive wind turbine mountain construct have on it's surroundings to an indefinite distance?

For the contest, the construct is a massive tetrahedron shaped construct that extends into the lower stratosphere of a roughly earth-like planet with several holes, tunnels in it containing wind ...
3
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0answers
46 views

What would a carbon-based organism encounter deep in Saturn?

Saturn's predominant lifeform begins with allotropes of elemental carbon: graphene, diamond, nanotubes and geodesic shapes. These are doped in places with nitrogen, phosphorus, and germanium. (...
5
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5answers
173 views

What is the most practical/effective transportation method between colonies/settlements on Mars?

Would transport between settlements on Mars be similar to Transport between Cities on Earth?, well except no boats because no oceans. so what would be the most practical mode of transport between ...
8
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3answers
1k views

Superfast Terraforming of the Moon by Portal from Earth

A science-fiction portal has been set up between Earth and the Moon. It uses a fold in space, so travel through the portal is effectively instantaneous. Initially there is an airlock to prevent Earth'...
15
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8answers
2k views

Portable source of fire for use by a flame-mage

A character in my world has the ability to greatly control flames. He can even amplify a small fire to a large inferno if necessary. However, there is one problem: He can't create fire out of nothing. ...
5
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3answers
81 views

How species-specific are tropical diseases and parasites?

Following on from a recent question about animals, concerning a group of people traveling sideways in time, to a world that resembles Earth as it would have been had humans never evolved, it occurs to ...
1
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1answer
77 views

Climate in a S-type orbit planet in a binary star system

I made a planet orbiting (S-type orbit) a K-type star in a binary system; the other star is F-type. Star F-type K-type Mass 1.3 M☉ or 2.6x1030 kg 0.7 M☉ or 1x1030 kg Radius 1.14 R☉ or 0.8x109 m 0....
5
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3answers
148 views

What emerging technologies could put at risk the engine and the exhaust of a diesel submarine with the 10 years ahead technology?

I am trying to build a blog of a short novel about a near-future technology-based sci-fi about the future of conflict. It starts with the stealing of an Israeli Dolphin-class submarine. I thought ...
35
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7answers
4k views

Delivering the Eternal Sausage

In a future world, well-to-do people have access to piped food that travels straight to their kitchens. Let us focus on one such food; the eternal sausage. My first idea was to simply force sausage ...